When you remove CMOS battey......

[knightwarrior007]

hi friends !


I would like to know , What happens when [3V lithium] CMOS battery is removed from [intel 915 GAV] motherboard ?

The problem is
* When i switched on UPS, the CPU starts automatically [ usually i power ON this ] and shows CHECKSUM BAD.. press f4 to enter setup.. only after entering setup and pressing "Esc", the start up screen is shown.. Time setting are wrong here...

* I just removed the CMOS battery and again fixed it.. After start up, the system slowed down.. when i tried to open "my computer", error notice was issued as like "try to save the data " and hanged..

* When i restarted again and again , the moniter is ON.. it's just blank.. nothing was shown.... the Power button and restart button in cabinet didn't work... The only control is UPS power button....

* AND FINALLY WHEN I CHANGED THE RAM TO ANOTHER SLOT THE SYSTEM WORKED NORMALLY.... everything is normal now...

WHAT ACTUALLY HAPPENS WHEN WE REMOVE CMOS AND FIX IT AGAIN ??

IS THIS A SERIOUS PROBLEM?? WILL IT HAPPEN AGAIN IF I DIDN'T GIVE ATTENTION... ??? PLZ HELP

[kingofspirals]

well first off when you remove the cmos battery it resets your bios settings to default values... the CHECKSUM BAD is a result of this... so if you've reset your bios settings you need to go into the bios and change the settings to match your current hardware setup... including current time and date... you may have a dead cmos battery... in this case... when you unplug your computer your BIOS is left with default settings....

when your screen goes blank and monitor isn't getting a signal it mean your BIOS is not Posting... and there is some kind of hardware issue with memory, the motherboard, Power Supply, the CPU, or the graphics card...

switching memory slots from for example: DIMM 2 to DIMM 1 slot may fix a memory issue your having... and allowed the BIOS to post...

I can only guess what the real issue is...or was... because I have no idea what the problem is?? as long as your not overclocking your hardware in the bios... I don't see that their is anything you need to worry about...

If you could tell us what exactly "was" the problem... did you fix it? or is their still a problem?? maybe I'm confused...

[MattyBoy]

Almost all motherboards use a small coin sized CMOS battery to store all BIOS settings along with the password. It is possible for the CMOS chip to become corrupted, which could cause a CMOS checksum error. To reset the password, unplug the PC, open the cabinet and remove the CMOS battery for approx. If this is the case, you will need to replace the CMOS chip itself. I wouldn't recommend this as a first resort. See if you can find firmware or new flash for your BIOS or CMOS and try installing that first.

[knightwarrior007]

what is overclocking ??

If i replace the CMOS with a new one, is there a need to reinstall OS ??

thank u friends

[Russell]

You will need to do an "in-place upgrade" of windows to fix the problems. CMOS batteries, on all computers, only have a certain amount of life and must be replaced after a time. Essentially you boot your XP CD like you are going to install. Along the way, it will do a "detecting previous operating system" and tell you it's found xxxx. At that point, you will have the option to "repair" it, select that option, and it will re-install windows, fixing the HAL (Hardware Abstraction Layer) problems and hard disk controller drivers.

[knightwarrior007]

thank u russell

[happymark88]

A. By Using the Motherboard Jumper:

In most motherboards CMOS battery is soldered, which makes it difficult to remove the battery. In this case we use another method.

Almost all motherboards contain a jumper that can clear all CMOS settings along with the BIOS password. The location of this jumper varies depending upon the motherboard brand. You should read your motherboard manual to check its location. If you don't have the manual then look for the jumpers near the CMOS battery. Most of the manufacturer label the jumper as CLR, CLEAR, CLEAR CMOS, etc.

When you find the jumper, look carefully. There will be 3 pins and the jumper will be joining the center pin to either left or right pin. What you need to do, is remove the jumper and join the center pin to the opposite pin. e.g. if the jumper joins center pin to left pin, then remove it and join center pin to right pin. Now wait for a few seconds and then again remove the jumper and join the center pin to left pin.

Make sure to turn the PC off before opening the cabinet and resetting the jumper.



B. By Using Software:


I have found that BIOS/CMOS Password Recovery Tool is the most effective.:
BIOS/CMOS Password Recovery Tool is a program that works instantly to remove any lost or forgotten BIOS/CMOS password. Simply boot your PC to DOS and execute the program, and get access to forgotten BIOS/CMOS passwords in just seconds

BIOS/CMOS Password Recovery Tool Service: http://www.biospasswordrecovery.com/

[happymark88]

A. By Using the Motherboard Jumper:

In most motherboards CMOS battery is soldered, which makes it difficult to remove the battery. In this case we use another method.

Almost all motherboards contain a jumper that can clear all CMOS settings along with the BIOS password. The location of this jumper varies depending upon the motherboard brand. You should read your motherboard manual to check its location. If you don't have the manual then look for the jumpers near the CMOS battery. Most of the manufacturer label the jumper as CLR, CLEAR, CLEAR CMOS, etc.

When you find the jumper, look carefully. There will be 3 pins and the jumper will be joining the center pin to either left or right pin. What you need to do, is remove the jumper and join the center pin to the opposite pin. e.g. if the jumper joins center pin to left pin, then remove it and join center pin to right pin. Now wait for a few seconds and then again remove the jumper and join the center pin to left pin.

Make sure to turn the PC off before opening the cabinet and resetting the jumper.



B. By Using Software:


I have found that BIOS/CMOS Password Recovery Tool is the most effective.:
BIOS/CMOS Password Recovery Tool is a program that works instantly to remove any lost or forgotten BIOS/CMOS password. Simply boot your PC to DOS and execute the program, and get access to forgotten BIOS/CMOS passwords in just seconds

BIOS/CMOS Password Recovery Tool Service: http://www.biospasswordrecovery.com/